Filled bag sewing machine



jam. 6, E948.

P. A. HERR FILLED BAG SEWING MACHINE Filed Aug. 1, 1945 2 Sheets-Sheet 2 6b 13 J1 2.5 i CIEN 6k 60@ 5f 20 19 @a 16 1F 18 3 Llz5 3/5 1101/ Z2 w'f- 7 A, 10 ,W f Z J 0 m Gg 5 E! fa/rig c. Wem' Patented Jan. 6, 1948 UNiTED STATES PATENT OFFICE FILLED BAG SEWING MACHINE Park A. Herr, Hillside, N. J., assignor to The Singer Manufacturing Company, Elizabeth, N. J a corporation of New Jersey Application August 1, 1945, Serial No. 608,176

Claims. l

This invention relates to sewing machines and more particularly to sewing machines adapted for closing lled bags.

Filled bags are usually closed by a two-thread chain-stitch sewing machine, and many forms of closures, each involving the use of a two-thread chain-stitch seam, heretofore have been proposed. Among these, are the through-and-through stitching of the bag walls with a conventional two-thread chain-stitch seam. In some instances this seam and the bag mouth are covered by a binding strip, to prevent sifting of the contents from the bag.

Another form of closure comprises a twothread chain-stitch seam sewed through the bag walls and through a relatively strong and heavy cord, which cord serves as means for rupturing the sewing threads when it is desired to open the bag. This cord is commonly known as a ripcord.

As is well understood, in the closing of a plurality of lled bags the sewing machine is usually run continuously while the bags are passed therethrough at spaced intervals, thus closing the bags and chaining-off between successive bags. The chains connecting the successive bags are subsequently severed, thereby leaving a portion 0f the chain attached to each side of each bag.

To enable the machine to chain-01T between bags, When making the conventional two-thread chain-stitch seam, it is esssential that the chain be kept constantly under control and that it be positively fed away from the stitching point by the feeding mechanism. This has been accomplished by the provision of an auxiliary springpressed presser-foot located behind and in line with the stitching point and which cooperates with a relatively ne serrated portion of the feeddog to grip and feed the chain.

Other and additional problems arise when sewing through a relatively heavy rip-cord viz: the cord must be introduced directly in line with the stitching point, it must be held taut and against lateral movement so that it will be penetrated by the needle; it must be supported so that the needle will not force it into the throat-plate needle-hole in the absence of work; and it must not move the main presser-foot off the work, otherwise the work will not be properly fed through the machine by the feeding mechanism.

Heretofore it has been necessary to provide a separate set of fittings (i. e. a throat-plate and a presser device) to equip a machine for producing each of the above described bag closing operations.

This invention has as its primary object to provide a single set of improved fittings designed to becapplied to a conventional two-thread chainstitch sewing machine to adapt the machine to perform, selectively, any one of a plurality of different bag closing operations, for example, through-and-through Vstitching of the bag walls with a rip-cord, or the same type of closure without a rip-cord.

With the above and other objects in View, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understoodby those skilled in the art.

In the drawings, Fig. 1 is a side elevation of a portion of a filled bag closing machine embodying the present invention,

Fig. 2 is an end view thereof looking in the direction indicated by the arrow A in Fig. 1.

Fig. 3 is an enlarged longitudinal sectional .view through the presser device, throat-plate and feeddog of the machine, such section being taken substantially on the line 3-3 of Fig. 1.

Fig. 4 is a sectional view taken substantially on the line 4-4 of Fig. 3.

Fig. 5 is a bottom view of the improved presserfoot.

Fig. 6 is a top view of the improved throatplate.

Fig. 7 is an enlarged longitudinal sectional view through the presser-foot, throat-plate and feeddog showing a rip-cord clamped between the presser-foot and the throat-plate.

Fig. 8 is a transverse sectional view taken on the line 8-8 of Fig. 7.

Fig. 9 is a View similar to Fig. 7 but showing the bag walls united by a conventional twothread chain-stitch seam, without rip-cord, and showing a thread-chain as being fed away from the stitching point.

Fig. 10 is a perspective view of a bag closure comprising a conventional two-thread chainstitch seam passed through the bag walls.

Fig. 11 is a perspective view of a bag closure comprising a two-thread chain-stitch seam, similar to that shown in Fig. 10, but including, additionally, a seam rip-cord through which the seam is sewn.

Referring more specifically to the drawings, the invention is disclosed as embodied in a sewing machine .comprising a frame including a bed I,

presser-foot from the work when the closure shown in Fig. 11 is being made.

From the foregoing it will be perceived that this invention has provided a single set of improved fittings for a filled bag closing machine which adapts the machine to be used to close bags either with or without a seam rip-cord and in which the work, the threads and the cord, under all the various conditions of operation, are so supported, controlled and fed as to produce perfect work and perfect chaining-off whether or not a rip-cord is included in the seam.

Having thus set forth the nature of the invention, what I claim herein is:

1. A bag closing machine having, in combination, stitch forming mechanism including a reciprocating thread-carrying needle and a cooperating thread-carrying looper; a throat-plate provided with feed slots and an aperture having one portion through which said needle is reciprocated and another portion through which the looper thread passes; a spring-pressed presserfoot having a sole portion. normally urged toward said throat-plate; a feed-dog operating through said feed slots and cooperating with said presserfoot to feed the work through the machine; said presser-foot having in its sole portion a cordguiding channel located in alignment with and at opposite ends of said aperture in the plane of reciprocation of said needle, whereby a cord passed through said channel is gripped between said presser-foot and said throat-plate forwardly and rearwardly of said aperture and held in the path of reciprocation of said needle, and said throatplate having shoulders intermediate the ends of said aperture for supporting the cord against the thrust of the needle.

2. A bag closing machine having, in combination, stitch forming mechanism including a reciprocating thread-carrying needle and a cooperating thread-carrying looper; a throat-plate provided with feed slots and a key-hole shaped aperture through a portion of which said needle is reciprocated; a spring-pressed presser-foot having a sole portion normally urged toward said throat-plate and provided with a needle-hole aligned with the aperture in said throat-plate and a toe portion disposed at an angle to said sole portion and provided with a cord-guiding bore; a feed-dog operating through said feed slots and cooperating with said presser-foot to feed the work through the machine; said presser-foot having in its sole portion a cord-guiding channel which receives a cord from said bore, the longitudinal axes of said channel passing between said needle-hole and said aperture whereby a cord passed through said channel is gripped between said presser-foot and said throat-plate forwardly and rearward'y of said aperture and held in the path of reciprocation of said needle, and means including inwardly projecting shoulders afforded by the walls of said key-hole shaped aperture for supporting said cord intermediate the ends of said aperture.

3. A bag closing machine having, in combination, stitch-forming mechanism including a reciprocating thread-carrying needle and a cooperating thread-carrying looper; a throat-plate provided with feed slots and a key-hole shaped aperture through a portion of which said needle is reciprocated; a spring-pressed presser device including a main presser-foot having a needlehole aligned with said aperture in the plane of reciprocation of said needle and an auxiliary presser-foot, said presser-feet being provided in their work-engaging faces with aligned 'cardh-y guiding channels the depths of whichA are less than the diameter of the cord to be passed therethrough, whereby a cord therein is compressed and gripped between the main presser-foot and said throat-plate forwardly and rearwardly of said aperture and held in the path of reciprocation of said needle, for attachment to thework,` said auxiliary presser-foot being yieldably supported for movement relative to the main presserfoot; means comprising inwardly projecting shoulders afforded by the walls of said key-hole shaped aperture to sustain the cord in opposition to the thrust of the needle; and a work-feeding mechanism through said feed slots and cooperating with said presser device to feed the work and the attached cord through the machine.

4, Special fittings for use in a bag closing machine having a reciprocating thread-carryingr needle, a cooperating thread-carrying looper, and a work-feeding mechanism including a feed-dog; comprising a throat-plate having feed-dog slots and an elongated aperture through one portion of which the needle is adapted to be reciprocated, and a presser-device comprising relatively yieldable main and auxiliary presser-feet of which the former is provided with a needle-hole adapted to be aligned with the aperture in said throat-plate, said main presser-foot having a cord-guiding channel located partly forwardly and partly rearwardly of said needle-hole and aligned therewith in the plane of reciprocation of the needle and adapted to hold a cord for penetration by the needle; said auxiliary presser-foot having a threadchain and cord guiding channel arranged in axial alignment with the channel in the main presser-foot; said throat-plate affording cord-supporting shoulders intermediate the ends of said elongated aperture to prevent the cord being forced into the aperture by the thrust of the needle.

5. In a chain-stitch sewing machine, in combination, a reciprocatory thread-carrying needle, a thread-carrying looper complemental to said needle in the formation of a two-thread chainstitch seam, a throat-plate provided with a needle aperture elongated in the line of seam formation and with feed slots including an auxiliary feed slot disposed rearwardly of and in alignment with said needle-aperture, said throat-plate providing a land between said needle-aperture and said auxiliary feed slot, a feed-dog operating through the throat-plate feed slots and including a feed-dog section operating through said auxiliary feed slot, and a presser-foot device opposed to said throat-plate and feed-dog, said presserfoot device comprising a main presser-foot having a sole-plate provided with a needle-aperture in alignment with the throat-plate needle-aperture, said sole-plate being provided in its workengaging face with a guide-channel extending in the line of seam formation, said channel having a portion disposed forwardly of the presserfoot needle-aperture and another portion ending within the length of the throat-plate needleaperture rearwardly of the path of needle-reciprocation, an auxiliary presser-foot mounted for movement relatively to said main presser-foot and disposed rearwardly of said presser-foot needle-aperture in the line of seam formation, said auxiliary presser-foot being provided in its workengaging face with a guide-channel in alignment with the guide-channel of the main presserfoot, and said guide-channel of the auxiliary presser-foot being opposed to said auxiliary feedincluding a feed-dog operating 2,434,158 7 dog section andhaving the beginninge'ndthereof opposed to said' throat-plate land. 1 c I o 7 Number PARK Af HERE; 5 j1,6o5,913 y 124,853 A lIHEFIIRENCES CITED I 1,355,160 The followmg references are ofV record in the 2,298,770

fue of this patent: 318,357

UNITED STATES PATENTS Name Date Bates Nov. 9, 1926 Peterson Mar. 19, 1872 Moffatt et a1 Oct. 12, 1920 Kucera. Oct. 13, 1942 Coles May 19, 1885 Jan. 6, 1948. A. w. HOERNLE- 2,434,159

'MACHINE FOR MAKING TERMIALS AND THE LIKE Filed Feb. 14, 1945 3 Sheets-Sheet l f TZ m` ADOLPH W. HOERNLE ATTORNEY 

